feat(ui): redesign restart flow as side-by-side dashboard (v1.5.0)

[ProduktEntdecker]

Summary

Replaces overlay-based UI with a split-panel dashboard layout:

• LEFT panel (220px): Status always visible with process progress
• RIGHT panel: Context-specific content and action buttons
• Window now resizable (420x360 min, 800x600 max)

Key improvements

• Status visible during admin password prompt
• Cancel button always accessible (scrollable content area)
• Cleaner state management (removed showingRestartOptions)

Dependencies

• Depends on PR fix(ui): show real progress status and add delay before transition (v1.4.1) #29 (v1.4.1) - merge that first

Test plan

• Build and run app
• Trigger Touch Bar restart - verify dashboard layout
• Test admin prompt flow - verify Cancel button visible
• Test window resizing within bounds
• Verify all states: idle, restarting, success, partialFailure, failure

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